Status and Integration of AP2 Monitoring and Online Steering

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1 Status and Integration of AP2 Monitoring and Online Steering Daniel Lorenz - University of Siegen Stefan Borovac, Markus Mechtel - University of Wuppertal Ralph Müller-Pfefferkorn Technische Universität Dresden HEPCG Workshop, Hamburg

2 2 Overview 3 Partners in AP 2 University of Siegen Online steering tool RMOST University of Wuppertal Job Execution Monitor Technische Universität Dresden User-centric monitoring of jobs and their resource usage

3 3 Job Execution Monitor and Expert System University of Wuppertal

4 4 Job Monitoring (1) Motivation Thousands of jobs/day in the LHC Computing Grid (LCG) Jobs either fail or finish successfully 30% of LCG jobs fail LCG software observes the grid infrastructure only Job status is unknown to the user Error detection is done manually only and hard to perform Up to now, hardware based monitoring only (GridICE,?)

5 5 Job Monitoring (2) Conclusion Detect errors within running jobs Identify sources of failures Classify errors (expert system) } Job Execution Monitor JEM provides data on Errors during execution Additional information about job execution (script tracing) Current status of hard- and software Information about site problems } No additional costs

6 6 Job Monitoring (3) Architecture of JEM 2 components (UI / WN) Information exchange via R-GMA Other exchange mechanisms will be studied UI-component Add WN-component to a job and submit Manage multiple jobs Receive the monitoring data Display hardware data using rrdtool, e.g. load average

7 7 Job Monitoring (4) WN-component Bash and Python tracing (script wrapper) Hardware monitor (watchdog) Publish data continuously On a JEM error, stop monitoring (stability) Outlook Integration into ATLAS SW framework Classification of failures (expert system) Integration into GGUS Preexecution tests (reliability) Display script tracing...

8 8 Grid Expert System (1) Helps fixing job failures and error conditions Architecture: Client-server architecture CLIPS expert system shell as backend Client-server connection via socket Many client interfaces possible Command line Web interface...

9 9 Grid Expert System (2) Work in progress Sources of data R-GMA Data retrieval take time Data continuously fed in Often not accessible Definition of rules Classification of job failures Looking for additional sources of data (MonALISA?) SAM database Data collected when needed Access restricted to known IP addresses CLIPS rules combine information from different sources

10 10 Online Steering of HEP Applications University of Siegen

11 11 What is RMOST? RMOST is a Result Monitoring and Online Steering Tool Supports ATLAS Grid jobs Integrated into the Athena framework and the ROOT visualization toolkit Online steering is an established mechanism to accelerate computational research Features of RMOST: Connect (securely) to an executing Grid job at runtime Monitor and visualize intermediate results Modify the job parameters without resubmitting the job

12 12 RMOST Components Main libraries are application independent Thin interface layer to ATLAS software Reusability of most components supports sustainability

13 13 RMOST: Interactive Grid Connection Fully operable Needs R-GMA Very slow: planned to substitute it Security depends on GSSAPI Works with Globus TK4 and glite (Globus TK2) Goal: distribute it with middleware (glite or/and D-Grid)

14 14 RMOST: Steering Library Application independent steering library Operable (test phase) Needs the Grid connection library Goal: Integration into D-Grid and/or ATLAS

15 15 RMOST: File Access Library Transparent redirection to remote files Without changes to a program s source code Based on dynamic linker: preload of the file access library Allows to open remote result files in visualization tools, which are designed for the use with local files 90% ready (scheduled for August) Needs steering library Goal: distribute it together with steering library

16 16 RMOST: GUI Operable (test phase) Needs QT3 Goal: distribute it together with steering library Extendable with arbitrary data types

17 17 RMOST: Interface Components Extensions for ROOT and Athena Python interface for GANGA plugin Application specific

18 18 User-Centric Monitoring of Jobs and their Resource Usage Technische Universität Dresden

19 19 Goals Usual scenario in HEP Hundreds or thousands of jobs User needs overview what is going on with his/her jobs Status, runtime information (resource usage) Two types of users Physicist with his/her analyses or simulation production Resource providers who want to know what is happening on their machines or Grid management that wants to plan infrastructure Provide sufficient information in a helpful way Graphical visualisation with interactivity Collect and prepare useful information

20 20 Architecture User Worker Worker Node Node Browser Visualisation Applet Visualisations Job Monitoring monitoring sensors Job Execution Monitoring stepwise User Application User Application (Physics) (Physics) Worker Worker Node Node Job Monitoring monitoring sensors Job Execution Monitoring stepwise User Application User Application (Physics) (Physics) Monitoring Box R-GMA Interactivity Overviews Details Timelines, Histograms... Portal Server GridSphere Monitoring Portlet R -GMA Worker Node Job Monitoring monitoring sensors User Application (Physics) Analysis Web-Service Interface to monitoring systems e.g. R-GMA Consumer

21 21 Major Improvements Since Last Meeting (1) Based on LCG worker node monitoring Script lcg-mon-wn is started on worker node if environment variable WN_MONITOR is set in jdl Extended to collect more information (configurable for user) General: job ID; user name; the names of the resource broker, the computing element and the worker node (WN); job ID on the WN CPU: WallClockTime; UsedCPUTime; load averages Memory: real, virtual, total, and free memory; free and total swap space Storage: free space on home, temporary and work directory; summary of file system properties File I/O: I/O rates for every l/o access by the application Network: received and transmitted network Job status: information from Logging&Bookkeeping

22 22 Major Improvements Since Last Meeting (2) I/O Monitoring Collects data for every I/O access e.g. Authorization Contacts VOMS 3 authorization levels user: access to her/his data only admin: access to site data voadmin: access to all VO data Visualization of the new data

23 23 Ongoing Work R-GMA temporary storage only Persistent storage of monitoring data Pre-analysis algorithms for monitoring data to give users hints for possible problems Gathering of Resource Broker data to compare requests and results Improvement of user interface Visualization Interactivity

24 24 Integration into glite Extended LCG WN monitoring uses the same interface as the old one Integration = just an updated rpm for the worker node Other components (Web Service, Gridsphere, visualization etc.) Independent of glite / Scientific Linux Only the Web Service needs some Java-Libraries to read out R-GMA Can be installed on a Scientific Linux node We have it running on SuSE installations

25 25 Integration into DGI or Other Projects System design generic Web Service for data gathering + visualization + Gridsphere integration independent of monitoring system and HEP Provide convenient interface for users Only LCG Worker Node monitoring, R-GMA and VOMS are HEP specific Allows to plugin other monitoring and VO management systems Globus / MDS Unicore Ganglia...

26 26 Summary and Outlook Integration of AP 2 Generic frameworks Many Components are independent of application specific software Cooperations with GANGA Goal: Integrate software into different distributions Monitoring Workshop next week in Wuppertal All D-Grid projects Cooperation among D-Grid monitoring groups Possibility to present already existing tools

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